diff --git a/e2e/platform/vertices.html b/e2e/platform/vertices.html
index 25cdd9fb4..e3807cda7 100644
--- a/e2e/platform/vertices.html
+++ b/e2e/platform/vertices.html
@@ -13,9 +13,18 @@
 </head>
 <body>
   <div class="mermaid">
+    info
+  </div>
+  <div class="mermaid">
+    graph TD
+      subgraph one
+        1
+      end
+  </div>
+  <!-- <div class="mermaid">
     graph TD
       A --> B --> C
-  </div>
+  </div> -->
 
   <script src="./mermaid.js"></script>
   <script>
diff --git a/src/diagrams/flowchart/flowDb.js b/src/diagrams/flowchart/flowDb.js
index c3ae951d8..cd4d4dae5 100644
--- a/src/diagrams/flowchart/flowDb.js
+++ b/src/diagrams/flowchart/flowDb.js
@@ -373,8 +373,8 @@ export const addSubGraph = function (_id, list, _title) {
   let nodeList = []
 
   nodeList = uniq(nodeList.concat.apply(nodeList, list))
-  for(let i=0;i<nodeList.length;i++){
-    if(nodeList[i][0].match(/\d/)) nodeList[i] = 's' + nodeList[i];
+  for (let i = 0; i < nodeList.length; i++) {
+    if (nodeList[i][0].match(/\d/)) nodeList[i] = 's' + nodeList[i]
   }
 
   id = id || ('subGraph' + subCount)
